4 Mass and Weight Mass is the amount of stuff (matter) in an object.The mass of an object will remain the same anywhere in the universe.Mass is measured in grams or kilograms.Weight is the mass (kg) of an object multiplied by the acceleration of gravity (9.8 m/s2).The weight of an object depends on the gravitational pull of the location in the universe.The gravitational pull on the Moon is only 1/6 of Earth’s gravitational pull.Weight is measured in newtons (N).

5 Mass and WeightExample: F=ma A person with a mass of 25 kg x 9.8 m/s2 gravitational acceleration is equal to 245 N of weight force. F= 25 kg x 9.8 m/s2 F = 245 N The person exerts 245 N of force on the ground. If the person went to the Moon, they would only weigh 1/6 of 245 N.